1/27/2024 0 Comments 18 8 stainless steel bolts![]() Hot dip galvanized, stainless steel and silicon bronze are usually recommended if the bolts (less than 1/2" in diameter) will be used with pressure preservative treated wood such as "ACQ" (Alkaline Copper Quaternary)-check local building codes and contact your lumber supplier for recommendations. Not all types are available in all materials and finishes. Unplated and uncoated steel bolts-referred to as plain finish-may also be available and are susceptible to rust. Stainless steel, though, is a better choice when corrosion is of concern. Hot dip galvanized is a thick coating of zinc that protects against corrosion in harsh environments. Zinc, the most popular and least expensive commercial plating, offers moderate corrosion resistance. Shoulder bolts and some hex bolts are available from domestic and/or Canadian manufacturers.Ĭommon finishes for steel are zinc plating and hot dip galvanizing. Steel remains the least costly material followed by stainless steel the copper alloys (such as brass and silicon bronze) are the most expensive. Never replace a graded bolt with a lower grade or lower strength-do not substitute a stainless steel or silicon bronze bolt for a Grade 5 or 8 bolt, or a brass bolt for a Grade 2, 5 or 8 bolt.Ĭommon materials include steel (unplated and plated-see more about finishes below), stainless steel, brass, silicon bronze, and nylon. Some bolts are not available in different strength grades while certain steel types are offered in SAE (Society of Automotive Engineers) Grade 2, 5 or 8 head markings identify grade. Head styles include cylindrical, flat countersunk, hex, round and square. It is also recommended that threads not be in the shear plane(s).ĭrive styles for externally wrenched bolts include 12 point, hex and square for internally wrenched, slotted and hex socket are typical. More exposed threads within the grip (the area between the head and nut) will result in a "springier" bolt. Conversely, there should be two full threads exposed on the head side of the nut to make sure the nut can be properly tightened. ![]() The bolt should be long enough to allow at least two full threads to extend beyond the nut face after tightening, which ensures full thread engagement with the nut. The size and length of inch series fasteners is specified in inches, usually fractional rather than decimal. Lengths can be as short as 3/8", again for stove bolts, but are usually between about 1/2" and 24". While stove bolts can be as small as 1/8" in diameter, expect typical bolt sizes to be between about #10 (3/16") and 1 3/4". Size refers to nominal diameter of the bolt while length is just that-how long the bolt is. "The point of a fastener is the configuration of the end of the shank of a headed fastener or of each end of a headless fastener." Point style varies by bolt type and some types are not pointed, such as carriage bolts. Unless noted otherwise, right-hand threads are standard, so turn the bolt (or nut) clockwise to tighten. Some types, though, are always fully threaded and others are always partially threaded. Short lengths are often fully threaded, longer lengths are partially threaded. Also, smaller sizes have more threads per inch than larger sizes-see Table 2 for a comparison between UNC and UNF threads per inch by bolt size. Consequently, the larger the number of threads per inch, the finer the thread. Coarse threaded fasteners have fewer threads per inch than fine threaded fasteners because coarse threads are farther apart. Unified inch coarse series (UNC, Unified National Coarse) threads are largely standard Unified inch fine (UNF, Unified National Fine) may be available too. So, officially, some bolts are really screws, like lag, shoulder and stove bolts. Also, stove bolts are often tightened and released by turning their head. Common bolts are listed in Table 1, or click on a type above for detailed information.īy definition, "A Bolt is a headed and externally threaded mechanical device designed for insertion through holes in assembled parts to mate with a nut and is normally intended to be tightened or released by turning that nut." There are exceptions, like anchor bolts, which are cast in concrete. Others, like carriage and elevator bolts, do not have diminutive equivalents. Some have similar, smaller screw counterparts-lag bolts are heavy-duty wood screws, for example. Depending on the type, uses include fastening wood to wood, wood to metal, metal to metal, and objects to wood and metal. ![]() Click on a BOLT type above to continue shopping… BOLTSīolts are generally considered to be larger than screws and are used in a wide variety of applications especially where load-carrying capacity is a requirement.
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